Messages in this thread | | | Date | Sat, 19 Sep 2009 20:12:31 +0200 | Subject | EXT4 RAID read performance | From | wbrana@gmail ... |
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Hello,
I'm considering replacing Reiser3 filesystem with some newer one. I ran compilebench benchmark. Read performance is lower with ext4. Is it expected or is it possible to fix it?
Ext4: read tree total runs 11 avg 20.47 MB/s (user 0.53s sys 0.74s) read compiled tree total runs 4 avg 32.94 MB/s (user 0.61s sys 1.17s)
Reiser3: read tree total runs 11 avg 26.33 MB/s (user 0.54s sys 0.81s) read compiled tree total runs 4 avg 41.82 MB/s (user 0.62s sys 1.36s)
RAID details:
md8 : active raid10 sda7[0] sdd7[3] sdc7[2] sdb7[1] 62925824 blocks 256K chunks 2 far-copies [4/4] [UUUU]
Ext4: mkfs.ext4 -E stride=64,stripe-width=128 /dev/md8 mount -t ext4 -o noatime,auto_da_alloc,commit=600 /dev/md8 /mnt/md8
Reiser3: mount -t reiserfs /dev/md8 /mnt/md8 mount -t reiserfs -o noatime,notail /dev/md8 /dev/md8
Ext4 results: intial create total runs 10 avg 172.76 MB/s (user 0.43s sys 0.60s) create total runs 14 avg 36.49 MB/s (user 0.42s sys 0.59s) patch total runs 15 avg 15.16 MB/s (user 0.24s sys 0.49s) compile total runs 14 avg 64.07 MB/s (user 0.10s sys 0.59s) clean total runs 10 avg 393.43 MB/s (user 0.02s sys 0.06s) read tree total runs 11 avg 20.47 MB/s (user 0.53s sys 0.74s) read compiled tree total runs 4 avg 32.94 MB/s (user 0.61s sys 1.17s) delete tree total runs 10 avg 2.51 seconds (user 0.24s sys 0.42s) delete compiled tree total runs 4 avg 2.63 seconds (user 0.28s sys 0.50s) stat tree total runs 11 avg 1.99 seconds (user 0.23s sys 0.18s) stat compiled tree total runs 7 avg 2.11 seconds (user 0.27s sys 0.21s)
Reiser3 results: intial create total runs 10 avg 82.74 MB/s (user 0.45s sys 1.13s) create total runs 14 avg 28.54 MB/s (user 0.45s sys 1.19s) patch total runs 15 avg 10.91 MB/s (user 0.24s sys 0.86s) compile total runs 14 avg 47.49 MB/s (user 0.10s sys 1.27s) clean total runs 10 avg 270.21 MB/s (user 0.02s sys 0.15s) read tree total runs 11 avg 26.33 MB/s (user 0.54s sys 0.81s) read compiled tree total runs 4 avg 41.82 MB/s (user 0.62s sys 1.36s) delete tree total runs 10 avg 3.38 seconds (user 0.24s sys 0.72s) delete compiled tree total runs 4 avg 4.14 seconds (user 0.27s sys 0.88s) stat tree total runs 11 avg 2.09 seconds (user 0.22s sys 0.18s) stat compiled tree total runs 7 avg 2.27 seconds (user 0.25s sys 0.21s)
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